// This is a simple Password Generator App that will generate random password maybe you can you them to secure your account.
// I tried my best to make the code as simple as possible please dont mind the variable names.
// Also this idea came in my mind after checking Traversy Media's latest video.

// Clear the concole on every refresh
console.clear();

// Range Slider Properties.
// Fill : The trailing color that you see when you drag the slider.
// background : Default Range Slider Background
const sliderProps = {
  fill: "#0B1EDF",
  background: "rgba(255, 255, 255, 0.214)",
};

// Selecting the Range Slider container which will effect the LENGTH property of the password.
const slider = document.querySelector(".range__slider");

// Text which will show the value of the range slider.
const sliderValue = document.querySelector(".length__title");

// Using Event Listener to apply the fill and also change the value of the text.
slider.querySelector("input").addEventListener("input", (event) => {
  sliderValue.setAttribute("data-length", event.target.value);
  applyFill(event.target);
});
// Selecting the range input and passing it in the applyFill func.
applyFill(slider.querySelector("input"));
// This function is responsible to create the trailing color and setting the fill.
function applyFill(slider) {
  const percentage =
    (100 * (slider.value - slider.min)) / (slider.max - slider.min);
  const bg = `linear-gradient(90deg, ${sliderProps.fill} ${percentage}%, ${
    sliderProps.background
  } ${percentage + 0.1}%)`;
  slider.style.background = bg;
  sliderValue.setAttribute("data-length", slider.value);
}

// Object of all the function names that we will use to create random letters of password
const randomFunc = {
  lower: getRandomLower,
  upper: getRandomUpper,
  number: getRandomNumber,
  symbol: getRandomSymbol,
};

// Generator Functions
// All the functions that are responsible to return a random value taht we will use to create password.
function getRandomLower() {
  return String.fromCharCode(Math.floor(Math.random() * 26) + 97);
}
function getRandomUpper() {
  return String.fromCharCode(Math.floor(Math.random() * 26) + 65);
}
function getRandomNumber() {
  return String.fromCharCode(Math.floor(Math.random() * 10) + 48);
}
function getRandomSymbol() {
  const symbols = '~!@#$%^&*()_+{}":?><;.,';
  return symbols[Math.floor(Math.random() * symbols.length)];
}

// Selecting all the DOM Elements that are necessary -->

// The Viewbox where the result will be shown
const resultEl = document.getElementById("result");
// The input slider, will use to change the length of the password
const lengthEl = document.getElementById("slider");

// Checkboxes representing the options that is responsible to create differnt type of password based on user
const uppercaseEl = document.getElementById("uppercase");
const lowercaseEl = document.getElementById("lowercase");
const numberEl = document.getElementById("number");
const symbolEl = document.getElementById("symbol");

// Button to generate the password
const generateBtn = document.getElementById("generate");
// Button to copy the text
const copyBtn = document.getElementById("copy-btn");
// Result viewbox container
const resultContainer = document.querySelector(".result");
// Text info showed after generate button is clicked
const copyInfo = document.querySelector(".result__info.right");
// Text appear after copy button is clicked
const copiedInfo = document.querySelector(".result__info.left");

// Update Css Props of the COPY button
// Getting the bounds of the result viewbox container
let resultContainerBound = {
  left: resultContainer.getBoundingClientRect().left,
  top: resultContainer.getBoundingClientRect().top,
};
// This will update the position of the copy button based on mouse Position
resultContainer.addEventListener("mousemove", (e) => {
  copyBtn.style.setProperty("--x", `${e.x - resultContainerBound.left}px`);
  copyBtn.style.setProperty("--y", `${e.y - resultContainerBound.top}px`);
});
window.addEventListener("resize", (e) => {
  resultContainerBound = {
    left: resultContainer.getBoundingClientRect().left,
    top: resultContainer.getBoundingClientRect().top,
  };
});

// Copy Password in clipboard
copyBtn.addEventListener("click", () => {
  const textarea = document.createElement("textarea");
  const password = resultEl.innerText;
  if (!password || password == "CLICK GENERATE") {
    return;
  }
  textarea.value = password;
  document.body.appendChild(textarea);
  textarea.select();
  document.execCommand("copy");
  textarea.remove();

  copyInfo.style.transform = "translateY(200%)";
  copyInfo.style.opacity = "0";
  copiedInfo.style.transform = "translateY(0%)";
  copiedInfo.style.opacity = "0.75";
});

// When Generate is clicked Password id generated.
generateBtn.addEventListener("click", () => {
  const length = +lengthEl.value;
  const hasLower = lowercaseEl.checked;
  const hasUpper = uppercaseEl.checked;
  const hasNumber = numberEl.checked;
  const hasSymbol = symbolEl.checked;
  resultEl.innerText = generatePassword(
    length,
    hasLower,
    hasUpper,
    hasNumber,
    hasSymbol
  );
  copyInfo.style.transform = "translateY(0%)";
  copyInfo.style.opacity = "0.75";
  copiedInfo.style.transform = "translateY(200%)";
  copiedInfo.style.opacity = "0";
});

// 默认先生成一个密码
generateBtn.click();

// Function responsible to generate password and then returning it.
function generatePassword(length, lower, upper, number, symbol) {
  let generatedPassword = "";
  const typesCount = lower + upper + number + symbol;
  const typesArr = [{ lower }, { upper }, { number }, { symbol }].filter(
    (item) => Object.values(item)[0]
  );
  if (typesCount === 0) {
    return "";
  }
  for (let i = 0; i < length; i++) {
    typesArr.forEach((type) => {
      const funcName = Object.keys(type)[0];
      generatedPassword += randomFunc[funcName]();
    });
  }
  return generatedPassword.slice(0, length);
}
